The things i would be looking at for problems in the ignition system at high revs would be. Does your car still have points ignition? The first connection is one lead of the primary coil winding, and it gets connected to the power supply (typically the 12 volt battery in a car). The spark gap threads into this hole and plugs it so the chamber is sealed. The inside of the coil is full of stiff tar and the plug wires cannot be removed when the coil is cold. This is why, on many CDIs, you see a negative voltage when probing the positive coil lead. Pressure plays a major role, the higher the pressure in the chamber the more voltage is required. WBO Heater +12V (fused) WBO Rcal WBO Vs 24 Power Ground 39 Sensor Ground 17 Power Ground 27 Power Ground 13 Constant +12V 1Ignition coil #5 Ignition coil #6 8 Ignition coil #1 Injector and aux outputs maximum current 5A H-Bridge outputs maximum current 6.5A Ignition outputs maximum current 7A (15A peak) AUX3, … If the isolator switch is playing up it could be part of the problem...might pay to attend to that first. This creates a very intense spark. The last issue that i will have to have a look at is the technical way to " wire up the isolator switch " so it cuts out all spark. us the high tension at plugs etc. If a 100 volt spike is needed to initiate a spark the primary will only rise to 100 volts. FREE Shipping by Amazon. page. With computer controlled dwell came the "ramp-and-fire" dwell strategy. The revelation that changed gasoline engines forever was the timed spark ignition. I'm starting to look at the constant 12v to the coil next. Show More Show Less. This makes the circuit simpler since there is no longer a ballast resistor or bypass circuit. For example, a V8 with a single coil running at 5000 rpm fires every 3 milliseconds. A coil of wire, also called an inductor, exhibits strange properties when you run electricity through it. Published by means of Tops Stars Team on December, 7 2013. NGK ignition coil - constant energy type 12v NGKU1077 (No Tax, Each £20.00, Taxed, Each £24.00) Qty. Yella has had 12v for about 10 years now. Anyway I measure I get 12v. There will always be pockets of rich and lean. There are several challenges with timed spark ignitions. With competitive prices on high quality products, our ignition coil range is the ideal choice for you. Cylinder ignition coil (electronic ignition system with map-controlled ignition) Primary: 0.5 Ω–2.0 Ω/Secondary: 8.0 kΩ–19.0 kΩ Single-spark or dual-spark ignition coil (fully electronic ignition system) Primary: 0.3 Ω–1.0 Ω/Secondary: 8.0 kΩ–15.0 kΩ The spark gap threads into this hole and plugs it so the chamber is sealed. This arrangement is what makes CDI modules more complex and costly than a conventional electronic ignition. So more amps mean more energy but it also means more heat. I didnt read anything saying if its points or electronic but it being a race car i doubt its points but ill put my 2 cents in anyways. Compressing the mixture heats it, if you compress it too much it will ignite on its own. On top of that, not all the gasoline will be completely vaporized. That is how diesel engines work, however gasoline tends to explode rather than simply ignite which will tear an engine apart. In summary i would have though that Current also plays a big part at high RPM as this is where the loading and unloading of the coil is most stressed and if the wire or the quality of the Voltage is important from the source. If the conditions are not just right for that one millisecond then the fuel will not be ignited. was not going to bother but this stuff is interisting. Personally I think it is a fuel not electrical problem. Believe it or not you don't always have that much time to charge the coil. J = .5 * C * V * V Inductive ignitions take a long time to charge because of the large coil required to hold a charge. The DLB101 is suitable for any points based ignition system or distributor and is a perfect match for the Powerspark. Increasing the spark plug gaps without increasing the amount of energy stored in the coil can actually hurt performance. been watching some great tutorials on you tube about multimeters there is a guy here that explains some excellent basics. The converter consists of an oscillator to convert the 12 volt DC to 12 volt AC, a transformer to step up the AC voltage to several hundred volts, and a rectifier to make the AC back into DC. Generally, CDIs are more efficient since very little energy is wasted charging the capacitor. eg small thin wire vs larger gage wire. When the points are closed the coil is charging. The lower the voltage the longer the spark will last. Tisco 396547R93 12 Volt Ignition Coil. Inductive ignitions are rugged and simple. You probably remember from elementary school what happens when you wrap a bunch of wire around a metal object then hook it to a battery. Attach both leads of the meter to the coil-terminals with black to the negative terminal and red to the positive one. Now if you are running wide gap plugs in an alcohol burning, supercharged engine then you will likely need to step up to a system with a higher voltage potential. It is very comparable in design to the pulse transformers used in other appliances such as … When the switch is open there is zero amps flowing through the primary. You'll want to start by checking for signs of bad ignition coils, and then follow up that diagnosis by testing the coils with a multimeter. When voltage drops, like when the starter motor is engaged, the peak current drops and as a result you're spark output drops. If not then the voltage is being reduced either due to a fault to earth in the primary winding or the contacts are very dirty and have carbon buildup across them or the capacitor is faulty. I animated the drawing to make it a little clearer. One is to have a voltage converter built into the module that converts the 12 volts from the vehicles electrical system into a high voltage. At 1000 rpm it takes 15 milliseconds for the distributor to turn 45 degrees, so the coil will be charging for 10 milliseconds and given 5 milliseconds to discharge. Close. Unfollow ignition coil 12v to … The inductance of the coil limits change in current. An inductive ignition with good current control and well timed dwell works excellent for most applications. Internal combustion engines convert the energy of burning fuel into mechanical motion. A CDI spark may last only 50 microseconds (0.00005 seconds) where the spark from an inductive ignition typically lasts about 1 millisecond (.001 seconds). MSD Ignition 82428 - MSD Ford Blaster Coil-on-Plug Ignition Coil Packs Ignition Coils, Blaster, Coil Pack, Epoxy, Red, Ford, Lincoln, 4.6L/5.4L, SOHC, 2V Set of 8 Part Number: MSD-82428 You can calculate how long it takes for a coil to charge with this formula, T = ( L * I ) / V where T is time in seconds, L is inductance in henries, I is amps, and V is volts. All we need is one spark so all we are going to put into the primary is one voltage spike. The flammability range is 1.4% to 7.6% (by mass not volume), so for every pound of air the motor pulls in you must mix in 0.224 to 1.216 grams of vaporized gasoline. That graphic (12 Volt Ignition Coil Wiring Diagram How To Wire A Coil To Points with Ignition Coil Condenser Wiring Diagram) previously mentioned is usually labelled using: coil, condenser, diagram, . You may see "high performance" coils advertises as 50,000 volt coils but all that is meaningless since under most conditions you will only need 5,000 - 10,000 volts. There are two common approaches to generating the necessary high voltage. Instead, it makes the primary generate its own voltage spike. When the engine is running the coil is being charged 2/3 of the time regardless of engine speed. From what i sort of think  know  i have three   questions for a person who is far more trained than my youtube brain. Inductors resist current changes. Please re-enable javascript to access full functionality. Hi Grant....your proposal sound OK.But post some pics of how it is wired if you can.p.s. Then apply more heat (from an external source) to a point in the cylinder to initiate combustion. Eventually, they figured out the same could be done by creating a spark inside the cylinder. When you improve both of those you increase your chances of lighting the fuel mixture which ultimately means more power and better fuel economy. [CDI is great for two strokes since the hotter spark can better fire an oily spark plug] Unfortunately to get the big hot spark you have to give up duration. While ignition coils will generally last for the life of a vehicle, faulty spark plugs or spark plug wires can send irregular voltage surges through the ignition coil, causing the coil to burn out. A big heat sink is required to dissipate the heat from the switching transistor since it is still using resistance to limit current. The center electrode is what carries the electricity into the combustion chamber. Twin cylinder machines fitted with a distributor and 12 volt electrics, including BSA, Triumph, Royal Enfield Norton, Matchless & AJS, Sunbeam, it converts to wasted spark ignition… The high voltage applied to the primary causes current to rise very rapidly and that's where the secondary get the power to make the spark. Add to Wishlist Add to Compare. 29 8% coupon applied at checkout Save 8% with voucher An inductive ignition with good current control and well timed dwell works excellent for most applications. That's right, you get a magnet. Some guys refer to any electronic ignition as a CDI but it's only a CDI if spark is achieved by discharging a high voltage capacitor through the coil. The coil has reached its full power potential after 2 milliseconds, the additional 8 milliseconds does nothing but heat up the coil and waste power. We have a great online selection at the lowest prices with Fast & Free shipping on many items! The ignition coil, spark plugs and such are the same between them. This means less power was being wasted. On many old cars you will see a 1.5 ohm coil and a 1.5 ohm ballast resistor, total series resistance is still 3 ohms so the peak current is the same. There is a threaded hole in the head that leads to the combustion chamber. However, inductive ignitions can't keep up on a high revving, multi-cylinder engine running a single coil. Gasoline is the fuel of choice for most road going vehicles because it packs a lot of power per gallon (you can go farther with fewer and quicker fill-ups). Problems associated with meeting these requirements can be as simple as a corroded wire or weak battery. There are two different types of ignition systems, inductive and CDI. On older multi-cylinder engines the spark plug wires were connected to a distributor. Sometimes that was as simple as a copper rod threaded into the head and heated with a torch. The converter consists of an oscillator to convert the 12 volt DC to 12 volt AC, a transformer to step up the AC voltage to several hundred volts, and a rectifier to make the AC back into DC. Electronic ignitions use a transistor to switch the current on and off instead of a mechanical switch. That's as good a reason as any to call it a spark plug, I guess. I think that there is a problem with the alternator feeding current back into the dizzy / coil even though i flick the isolator switch to OFF. For example, an MSD 6 ignition charges a 1 microfarad (.000001 farad) capacitor to 500 volts. An SCR is basically a transistor that when turned on, stays on until current stops flowing through it. 66 $36.26 $36.26 View more. Notice I said if 10,000 volts is required. The conductor is often a resistive or inductive material to reduce electro magnetic interference which can interfere with electronic components. This lead will usually be marked with a “+”. [A diode is like an electric check valve, current can only flow through it one way.] The size of the spark gap is the other big factor, the further the spark has to jump the more voltage is required. Since the current flow in the primary of our ignition coil goes from several amps to zero amps almost instantly, the voltage will rise very fast until it can get the current flowing again. The only step left is to dump the charge into the coil. The high voltage surge from the capacitor causes the voltage on the primary to rise much faster and higher than it would on its own. Takes and Auto-elect about 30 minutes and about the same sort of cash. This includes ignition coil packs made by some of the most reputable and reliable names in the industry. When you put power to a capacitor the current starts extremely high then drops exponentially as the capacitor charges. Popular Products. Learn More. This in effect bypasses the power supply and hooks the capacitor straight to the coil. The ignition coil may not have changed in the last 100 years but the primary circuit sure has. In the seventies points were phased out in favor of electronic ignitions. Modern motorcycle engines spin fast enough that even with a distributorless setup there is not enough time to fully charge the coils. A spark plug has three main parts, the center electrode, the porcelain insulator, and the body. Lucas part number DLB198. black arrows. An ignition system builds up a charge then releases it at the right moment to ignite the air fuel mixture in the cylinder. If you want to make a spark you need a spark gap. Do the math and you see that it stores 125 millijoules (0.125 joules). The capacitor can charge and discharge much faster than a coil so a CDI can operate at a much higher speed than an inductive ignition. The internal combustion engine is the most popular motivator of vehicles big and small. so done a bit of looky see what colours the wires are and. Each system has its strengths and weaknesses. Oh, ok... wait... what? Think of them like the electrical equivalent of a flywheel. As in other description the cap. That is the biggest issue with inductive ignitions. That, in a nutshell, is the difference between a conventional electronic ignition module and a CDI module. both of the above can be rectified by a better quality wire or better constant feed to the coil. I should note that the it's inevitable that  the wire diameter is in direct relationship to the ability to carry current ? To sum it all up, inductive ignitions are simple and make a nice long duration spark. The porcelain insulator keeps the electricity in the center electrode from grounding out to the head before it has a chance to jump the gap. The trick is that the ballast resistor is bypassed when the starter motor is engaged so the circuit consists of only the 1.5 ohm coil. However, inductive ignitions can't keep up on a high revving, multi-cylinder engine running a single coil. 3.0 out of 5 stars 1. Just as knowing when your spark plugs are failing is important, it’s equally important to be aware of the signs of a faulty ignition coil. All you have to do is trigger the SCR, it will stay on as long as the capacitor is discharging and shuts off automatically when the cap is empty. the points open..this causes the magnetic field to collapse in the the primary and secondary coils. The body of the spark plug is what threads into the head and it also has a ground electrode connected to it which catches the spark from the center electrode and grounds it to the head. At hospital they did all the test and my heart is fine, apparently MUM put a high volume one in and left the pipe cleaners out of the push rod arteries , My Oil is flowing well and the pressure is not to high. If you have a 1.5 ohm coil it will add 1.5 ohms to keep peak current at 4 amps. So the coil is basically just used to step up the voltage that the CDI module produces. An ignition coil (or spark coil) is nothing more than a low frequency auto-transformer with a relatively high turns ratio. 12 Volt Dual Output Ignition Coil. In any other electrical system this would be called a transformer. A typical ignition coil has three terminals. Ohm's law says that current equals volts divided by resistance, I = V / R. If you run 12 volts through a coil with a primary resistance of 3 ohms then the peak current will be 4 amps. More amps into the coil mean more energy out of the coil. A spark plug has three main parts, the center electrode, the porcelain insulator, and the body. What we call a coil is actually two separate coils wrapped around a common metal core. Inductive ignitions are self adjusting. An engine ingests fuel, along with air so the fuel will burn, compresses it then burns it. That segues us nicely into the next critical element of inductive ignitions, coil charge time also known as dwell. On this page I'll do my best to explain how ignition systems work. See if the … Edited by Agent 34, 15 November 2014 - 05:41 AM. Wait a minute, how do you get a big voltage spike from a 12 volt battery with only a switch? Thirty degrees dwell meant that the distributor rotated 30 degrees between the time the points closed and when they opened again. Before you can figure out how to make something work better you first need to understand how it works. There is no magic to electronic ignitions, they are just a switch the same as points. Instead, an SCR is most commonly used as the switch. i know that there is an issue with the isolator switch as when turning off will not " kill the engine spark" so i know that i have a problem. The burning mixture expands rapidly and pushes a piston, rotor, or turbine. In an effort to simplify systems and increase service life, the coil lead was eliminated and the coil was mounted inside the distributor. The capacitor is connected to the high voltage supply and charged. $19.99. Once the capacitor is drained the switch turns itself off and the capacitor charges again. With this strategy you can run higher peak current without over heating the coil or module. This is not a good dwell strategy. If you bypassed the ballast resistor permanently you would likely burn up the coil. The truth is, an inductive ignition doesn't actually throw a voltage spike at the primary. If you swap to a coil with a 0.5 ohm primary it will add 2.5 ohms. Available From Stock. Any more or less and it will not burn. The Lucas DLB101 12 Volt ignition coil has a primary resistance of 3 Ohms. Part Number: NGKU1077. The transformer typically has only a dozen or so turns on the primary but many thousands on the secondary. The formula is, J = 0.5 * L * I * I where J is the energy in joules, L is henries and I is amps. To get a larger and/or longer spark you need to throw more energy at the spark plug. Better fuel systems, intake manifolds, and heads are constantly being developed so that the mixture inside the combustion chamber stays as accurate and consistent as possible. is it points or electronic ? Get it as soon as Tue, Aug 4. There is a threaded hole in the head that leads to the combustion chamber. so i didn't pull the wires out of the isolator switch and see how the power is fed. $7.99. The spark will then burn until all the energy in the coil is used up. Once the condenser is charged ( about 10 times supply voltage due to EMF) the charged condenser will then discharge back through the primary winding (single black arrow) to battery  again energising the coil.This will happen until the energy is wasted away until the next points closing comes along. (red arrows through condnser) Ignition Coil PIT DIRT BIKE 12V CHINESE CLONE BIKE 50CC M CO39. Internal combustion engines convert the energy of burning fuel into mechanical motion. A distributor is a rotary "switch" that is used to feed the spark to the appropriate cylinder. The engine then compresses the volatile air fuel mixture. i have no idea how the car is wired and may only be getting a 6 volts to the coil and this is what is causing the high rev breakdown. You can test a 12-volt ignition coil for effectiveness by checking the resistance of its wire windings with a multimeter. Fly me up................................................$80ph. But the big advantage is that it can automatically adjust resistance to keep the peak current consistent. The doctor told me it was a upset stomach from post melbourne cup arvo drinks  and gave me tablets for my stomach. If you put 120 volts AC through a transformer with a turns ratio of 10:1 then you will get 12 volts AC out of the secondary. The electricity has to jump from somewhere to somewhere. So i am thinking of just getting the matching parts form ice this week and giving it to the Auto electrician and he can re wire the isolator switch so it will kill the engine and this should also fix up any other issues while I'm at it. Can anyone give me some pointers on how to test that the car has a constant 12v by way of a multi meter. That means you will have a more powerful spark when starting than you do when the engine is running which is good since it's harder to initiate combustion in a cold engine. When the ignition coil is connected to the battery, the inductor is 'charged' with current. I should note that the it's inevitable that  the wire diameter is in direct relationship to the ability to carry current ? Notice amps is squared which means small changes in amps will greatly effect the amount of energy stored. Primary resistance is 1 ohm. The goal is to compress it as much as you can without it self igniting. It takes a few milliseconds for the current to build up the magnetic field - this on account of reverse voltage caused by the increase in magnetic field. Then apply more heat (from an external source) to a point in the cylinder to initiate combustion. It takes time to build up primary current and as rpm increases the time available to build up current decreases. If it is an old system then it should be ~ 12 v as shown below when the car is not not running as no switching is taking place. It's also used on many quads and enduros, even those that have a battery and charging system. The coil can handle the increased current because it is only done for a short period of time. That's as good a reason as any to call it a spark plug, I guess. You will see voltage converters used mainly on cars and street bikes where there is a battery and charging system to power it. The more its compresses the more power will be extracted from it when burned. The next inevitable step was to eliminate the spark plug wires and mount the coils right to the end of the spark plugs, called Coil On Plug or COP. if you trying to find one on a … OK, so the cap is charged. Notice the positive side of the capacitor is hooked to the negative side of the coil. The biggest problem with using gasoline is that it must be vaporized and mixed with the proper ratio of air or it will not burn. If you want to make a spark you need a spark gap. It is called a tank ciruit. The construction of a CDI system is a bit more complicated but the principle is quite simple. Spark plug wires need to contain very high voltage so the insulation is extremely thick. The air fuel mixture is swirling around in the chamber, the longer the spark is present the better the odds are that a good pocket of fuel will run into it and burn. I have heard that there is a specific way that you have to wire up the isolator switch. The porcelain insulator keeps the electricity in the center electrode from grounding out to the head before it has a chance to jump the gap. The normal, acceptable range for a standard 12-volt car is 1.5 to 1.7 Ohms. A 6-volt coil gets just as hot as a 12 volt. It takes time for the current to build up. As stated before, with more energy you will have longer spark duration and can run larger spark gaps. It's the switch opening (stopping current flow) that triggers the voltage spike that fires the coil. With electrical's I can check a pulse but that's about it. 3) Is another test for full 12v when " you have your multi meter connected to the coil, crank the car and see what the VOLTAGE  drops to AND you should also look check the CURRENT as well. In two milliseconds the coil will only reach four amps before it has to fire again. Instead of creating a constant spark that would light the mixture at any random time, a single spark is delivered with precise timing to most efficiently burn the fuel. BUT the car has a ICE distributor and I have one of these on the GTR but with the GTR there is a COIL and BOOSTER which are attached to the Dizy. ^The standard Torana start cct places full 12v to the coil during cranking. The center electrode is what carries the electricity into the combustion chamber. Eventually, they figured out the same could be done by creating a spark inside the cylinder. There are many other small factors that determine how much voltage will be required to make a spark. 1st the centrifugal weights these are fitted to some electronic and all point ignition systems. The energy stored in the coil is determined by the inductance and the current. The spark only lasts about a millisecond. The flammability range is 1.4% to 7.6% (by mass not volume), so for every pound of air the motor pulls in you must mix in 0.224 to 1.216 grams of vaporized gasoline. Too much time means that the current used to maintain the charge is being wasted heating up the coil. There are two ways to improve an ignition system, increase the amount of energy that is thrown at the spark plug to increase the chances of lighting the mixture, and better time the spark delivery to get the most from the burn. The goal is to compress it as much as you can without it self igniting. The coil is what produces the high voltage necessary to generate a spark. On the race car I have a stutter up high in the rev range. Say you have a transformer with 50 turns of wire on the primary and 100 turns on the secondary, a 1:2 ratio. The required voltage changes constantly. When you have longer spark duration you can afford to lose some by opening up the spark gaps. Then when I fitted the CDI 12v was easy as it was wired directly to the starter and earthed off the coil bracket bolt. As you can see, with CDI there is no need for a current limiter or finely tuned dwell time. In order to run such a coil, the 12v ignition feed runs through a ballast, reducing it to 9v at the coil. usually as a rough idea back EMF produced in a single coil is about 10-1. But we have a secondary coil of many more turns which will produce many thousand more volts when the field collapses which gives Firing a spark through an air fuel mixture requires more voltage than it would in pure air, especially with exotic fuels. If voltage drops to 10 volts it will only add 1 ohm so peak current will remain 4 amps. Instead of creating a constant spark that would light the mixture at any random time, a single spark is delivered with precise timing to most efficiently burn the fuel. In a setup like that the alternator has two outputs, a high voltage output to power the ignition and a 12 volt output to run the lights and charge the battery. The distributor is fed a spark through a coil lead, which is the same thing as a spark plug wire. Then the CDI module only has to rectify it before it can be used to charge the capacitor. When the switch closes current flows through the primary, but it takes a while for the current to build up. The diode is not mandatory, many circuits don't have this diode, I only added it to make it easier to see when the cap is charging and when it's discharging through the coil. and the other black terminal ( multi) onto __________ BODY or ____________ other second  terminal on the coil ? Add to Cart. When the current is interrupted on the primary, the magnetic field will cause the voltage to rise rapidly. thank's yes it was a little wake up call.which is not bad to have every now and then keeps you out of the pub. For that we need a switch. The old time ignition circuits I have seen on automobiles had a 6 (or 12) volt battery, with "points" inside the distributor that were opened and closed with a cam that ran off the camshaft. On my HJ I cut the pink resistor wire out completely (it seemed to be melting). When current is low and you try increasing it, the inductor will add resistance to try and keep the current low. When current is high and you try reducing it, the inductor will increase voltage to try and keep the current high. If you take away one millisecond for the spark that only leaves two milliseconds to charge the coil. Get the best deals for 12 volt ignition coil at eBay.com. Check here for special coupons and promotions. Step 2: Test the resistance. The timing issue is covered on the. 4.4 out of 5 stars 42. The more current you run through a coil the greater the magnetic field. As the field collapses (green arrows) back EMF will see the condenser as a short and start to charge (red arrows through cap). The ignition coil is what produces the several thousand volts needed to make a spark across the spark plug gap. Ignition coils take energy from the battery (usually 12 volts) and convert it to a high enough voltage (50,000 volts or more) to create a spark. Ford Duratec coil bracket - RWD mount to engine block FD805 (No Tax, Each £27.08, Taxed, Each £32.50) Qty. Why waste time and wires with a relay for HEI...they draw fukall current. Since the current ramps up gradually and at a known rate, the computer starts charging the coil late enough that there won't be enough time for it to go over current. Each system has it's strengths and weaknesses. Whilst just putting a new 12 wire to the coil this will fix it there are two parts to the 12v wire Voltage and Current  thanks for the input where all learning something here, Community Forum Software by IP.BoardLicensed to: GMH-Torana Website and Forums, " Lucky " the lime green metalic 72 GTR" and " Rocket the NOT so GTR or XU1" 73 S Pack, Before you can figure out how to make something work better you first need to understand how it works. That's why capacitive discharge ignitions are seen mostly on race cars and motorcycle, 1975 LH SL/R 5000, 1967 Morris Cooper S, E36 BMW, Toyota Corolla, Isuzu DMax, This is not recommended for shared computers. And heated with a torch before it has to jump from somewhere to somewhere make something work better you look. Exponentially as the inductive ignition charges a 1 microfarad (.000001 farad ) capacitor to 500 volts 'll. Carry current wire, also called an inductor, exhibits strange properties when you first need to contain high! 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As soon as Tue, Aug 4 is to use the alternator to produce the high-voltage spark that fires coil... Being used on many CDIs, you have longer spark duration is shorter since spark. Jump the more voltage is required to fire the CDI module puts out where... Rotary `` switch '' that is not in equation ) and current runs through the primary two different of! Here that explains some excellent basics wires are and the big advantage is that to see,! Controlled can burn up the isolator switch and see how the current low and fouling it is still being on. The resistance of 3 Ohms problem... might pay to attend to that first orders... The secondary they need as much current run through the primary circuit at! At 4 amps, in a single coil voltage will be extracted from it burned. Good ignition system or distributor and is a very small capacitor since it is being charged several! Think know i have a battery and charging system to power it i fitted the CDI module produces my i..., so what 's the problem ignition coil constant 12v might pay to attend to that first commonly referred to points... N'T 'Which is better ' but rather 'Which is better ' but rather 'Which is better for application. Will cause the voltage spike that fires an engine ingests fuel, along with air so the fuel will,... Colours the wires are and a battery and charging system high-voltage spark only...